Graft anchor

• US 6,231,606 B1
• Filed: 02/18/1997
• Issued: 05/15/2001
• Est. Priority Date: 02/16/1996
• Status: Expired due to Term

• Current Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Original Assignee: Smith & Nephew Incorporated (Smith & Nephew PLC)
• Inventors: Graf, Ben K., Ferragamo, Michael C., Brown, Charles H. Jr., Blough, Rebecca A.
• Primary Examiner(s): Milano, Michael J.
• Assistant Examiner(s): Cuddihy, Francis K.
• Application Number:
  US08/800,961
• Time in Patent Office: 1,547 Days
• Field of Search: 623/11, 623/13, 623/16-23, 623/27, 623/39, 623/66, 606/60-61, 606/65-67, 606/69-71, 606/78, 606/105, 606/232
• US Class Current: 606/232
• CPC Class Codes: A61F 2/0805 Implements for inserting tendons or ligaments
• CPC Class Codes: A61F 2/0811 Fixation devices for tendons or ligaments
• CPC Class Codes: A61F 2002/0829 without deformation of anchor parts, e.g. fixation screws on bone surface, extending barbs, cams, butterflies, spring-loaded pins
• CPC Class Codes: A61F 2002/0835 with deformation of anchor parts, e.g. expansion of dowel by set screw
• CPC Class Codes: A61F 2002/0852 Fixation of a loop or U-turn, e.g. eyelets, anchor having multiple holes
• CPC Class Codes: A61F 2002/0858 Fixation of tendon or ligament between anchor and bone, e.g. interference screws, wedges
• CPC Class Codes: A61F 2002/0864 Fixation of tendon or ligament between anchor elements, e.g. by additional screws in the anchor, anchor crimped around tendon
• CPC Class Codes: A61F 2002/0882 Anchor in or on top of a bone tunnel, i.e. a hole running through the entire bone
• CPC Class Codes: A61F 2002/0888 Anchor in or on a blind hole or on the bone surface without formation of a tunnel

Abstract

A graft anchor includes an anchor member for placement in bone tissue. The anchor member defines an opening. An inner member is insertably securable into the anchor member opening. A fastener is configured such that insertion and securing of the inner member into the anchor member opening results in a holding force being applied to the graft. The anchor member is of limited length to maintain its distal end within the bone. The anchor member includes a distal drive opening for receiving a drive tool and the inner member includes a proximal drive opening for receiving the drive tool. The fastener includes channels for containing the graft, a fastener body with protrusions extending from the fastener body for penetrating bone tissue, and a reinforcing member contained within the fastener body.

Claims

1. A graft anchor comprising:

an anchor member configured for placement in bone tissue, said anchor member defining an opening,

an inner member insertable and securable into said anchor member opening, and

a fastener for applying a holding force to a graft, said fastener having a tissue facing surface defining a protective, walled channel for at least partially containing said graft, said channel substantially traversing said tissue facing surface of said fastener, said fastener being configured such that insertion and securing of said inner member into said anchor member opening results in said holding force being applied to said graft.

2. The graft anchor of claim 1 wherein said anchor member is of limited length to maintain a distal end of the anchor member within the bone.

3. The graft anchor of claim 1 wherein said anchor member opening is a threaded axial bore.

4. The graft anchor of claim 3 wherein said axial bore includes a distal drive opening for receiving a drive tool.

5. The graft anchor of claim 4 wherein said distal drive opening is hexagonally shaped.

6. The graft anchor of claim 3 wherein said inner member includes external threads for mating with threads of said threaded axial bore.

7. The graft anchor of claim 6 wherein said inner member includes a smooth shank proximal of said external threads.

8. The graft anchor of claim 1 wherein said anchor member includes external threads.

9. The graft anchor of claim 8 wherein said external threads are self-tapping.

10. The graft anchor of claim 1 wherein said inner member includes a proximal drive opening for receiving a drive tool.

11. The graft anchor of claim 10 wherein said proximal drive opening is hexagonally shaped.

12. The graft anchor of claim 1 wherein said fastener includes a guide defining said channel.

13. The graft anchor of claim 1 wherein said fastener includes a plurality of protective, walled channels for substantially containing the graft, said channels substantially traversing said tissue facing surface of said fastener.

14. The graft anchor of claim 1 wherein said fastener includes a fastener body and at least one protrusion extending from said fastener body for penetrating bone tissue.

15. The graft anchor of claim 14 further including a plurality of protrusions.

16. The graft anchor of claim 14 wherein said fastener further includes a reinforcing member contained within said fastener body, said fastener body having a strength less than said reinforcing member.

17. The graft anchor of claim 1 wherein said fastener defines a through bore.

18. The graft anchor of claim 17 wherein said fastener includes a lip surrounding said through bore which separates the graft from said through bore.

19. The graft anchor of claim 1 wherein said fastener body has a generally circular shape.

20. The graft anchor of claim 19 wherein said fastener body includes two flat sides.

21. A graft anchor comprising:

an anchor member configured for placement in bone tissue, said anchor member being of limited length to maintain a distal end of the anchor member within the bone,

said anchor member comprising an axial bore having an internal threaded section and a distal drive opening for receiving a drive tool, said anchor member further having external, self-tapping threads,

an inner member having external threads and a proximal drive opening for receiving said drive tool, said inner member being threadedly insertable and securable in said anchor member axial bore, and

a fastener for applying a holding force to a graft, said fastener including a fastener body and at least one protrusion extending from a tissue facing surface of said fastener body for penetrating bone tissue, said tissue facing surface defining a protective, walled channel for at least partially containing the graft, said channel substantially traversing said tissue facing surface of said fastener, said fastener being configured such that insertion and securing of said inner member through a central bore of said fastener and into said anchor member opening results in said holding force being applied to said graft.

22. A graft anchor comprising:

an anchor member configured for placement in bone tissue substantially below a surface of the bone tissue, said anchor member defining an opening,

an inner member insertable into said anchor member opening, said inner member including a smooth proximal shank, and

a fastener for applying a holding force to a graft, said fastener being configured such that insertion and securing of said inner member in said anchor member opening results in said holding force being applied to said graft, said inner member smooth proximal shank protecting said graft during insertion and securing of said inner member in said anchor member opening.

24. The graft anchor of claim 22 wherein said inner member has a rounded distal end.

25. The graft anchor of claim 22 wherein said fastener defines a through bore.

26. The graft anchor of claim 25 wherein said fastener includes a lip surrounding said through bore for separating said graft from said through bore.

23. A graft anchor comprising:

an anchor member configured for placement in bone tissue, said anchor member defining an opening,

an inner member insertable and securable into said anchor member opening, and

a fastener for applying a holding force to a graft, said fastener defining a channel for receiving said graft and including two, opposed flat sides, said fastener being configured such that insertion and securing of said inner member into said anchor member opening results in said holding force being applied to said graft.

27. The graft anchor of claim 23 wherein said channel substantially traverses a tissue facing surface of said fastener, and said flat sides are substantially parallel to said channel.

28. The graft anchor of claim 23 wherein said channel substantially traverses a tissue facing surface of said fastener, and said flat sides are substantially perpendicular to said channel.

29. A graft anchor comprising:

an anchor member configured for placement in bone tissue, said anchor member defining an opening,

an inner member insertable and securable into said anchor member opening, and

a fastener for applying a holding force to a graft, said fastener including a fastener body and a reinforcing member contained within said fastener body, said fastener body having a strength less than said reinforcing member, said fastener being configured such that insertion and securing of said inner member into said anchor member opening results in said holding force being applied to said graft.